fix: preserve emoji characters in tag slugification

dist/components/index.js

@@ -1,13 +1,9 @@
 import { createRequire } from 'module';
+import { classNames } from '@quartz-community/utils/lang';
 import { joinSegments, simplifySlug as simplifySlug$1 } from '@quartz-community/utils';
 import { jsxs, jsx, Fragment } from 'preact/jsx-runtime';
 
 createRequire(import.meta.url);
-
-// src/util/lang.ts
-function classNames(...classes) {
-  return classes.filter(Boolean).join(" ");
-}
 function simplifySlug(fp) {
   return simplifySlug$1(fp);
 }

dist/index.js

@@ -1,4 +1,5 @@
 import { createRequire } from 'module';
+import { classNames } from '@quartz-community/utils/lang';
 import { joinSegments, simplifySlug as simplifySlug$1 } from '@quartz-community/utils';
 import { jsxs, jsx, Fragment } from 'preact/jsx-runtime';
 
@@ -10289,7 +10290,7 @@ function coerceToArray(input) {
 }
 function slugTag(tag) {
   return tag.split("/").map(
-    (segment) => segment.replace(/\s+/g, "-").replace(/[^\w\p{L}\p{M}\p{N}/-]/gu, "").toLowerCase()
+    (segment) => segment.replace(/\s+/g, "-").replace(/[^\w\p{L}\p{M}\p{N}\p{Extended_Pictographic}/-]/gu, "").toLowerCase()
   ).join("/");
 }
 function getFileExtension(fp) {
@@ -10453,11 +10454,6 @@ var NoteProperties = (userOpts) => {
     }
   };
 };
-
-// src/util/lang.ts
-function classNames(...classes) {
-  return classes.filter(Boolean).join(" ");
-}
 function simplifySlug(fp) {
   return simplifySlug$1(fp);
 }

src/transformer.ts

@@ -46,7 +46,7 @@ function slugTag(tag: string): string {
     .map((segment) =>
       segment
         .replace(/\s+/g, "-")
-        .replace(/[^\w\p{L}\p{M}\p{N}/-]/gu, "")
+        .replace(/[^\w\p{L}\p{M}\p{N}\p{Extended_Pictographic}/-]/gu, "")
         .toLowerCase(),
     )
     .join("/");

test/slugTag.test.ts

@@ -0,0 +1,50 @@
+import { describe, it, expect } from "vitest";
+import { VFile } from "vfile";
+import { NoteProperties } from "../src/transformer";
+import type { BuildCtx } from "@quartz-community/types";
+
+const runWithTag = (tag: string): string[] => {
+  const plugin = NoteProperties({});
+  const ctx = { allSlugs: [] } as unknown as BuildCtx;
+  const plugins = plugin.markdownPlugins!(ctx);
+  const transformerFactory = plugins[1] as () => (tree: unknown, file: VFile) => void;
+  const transformer = transformerFactory();
+
+  const escapedTag = tag.replace(/"/g, '\\"');
+  const markdown = `---\ntags:\n  - "${escapedTag}"\n---\ncontent`;
+  const file = new VFile({
+    value: new TextEncoder().encode(markdown),
+    path: "note.md",
+  });
+
+  file.data = {};
+  transformer(null, file);
+
+  return (file.data.frontmatter as { tags: string[] }).tags;
+};
+
+describe("slugTag", () => {
+  it("preserves emoji in tags", () => {
+    expect(runWithTag("0🌲")).toEqual(["0🌲"]);
+  });
+
+  it("converts spaces to hyphens", () => {
+    expect(runWithTag("my tag")).toEqual(["my-tag"]);
+  });
+
+  it("strips special characters", () => {
+    expect(runWithTag("tag?#&")).toEqual(["tag"]);
+  });
+
+  it("keeps nested tag separators", () => {
+    expect(runWithTag("parent/child")).toEqual(["parent/child"]);
+  });
+
+  it("lowercases tags", () => {
+    expect(runWithTag("MyTag")).toEqual(["mytag"]);
+  });
+
+  it("preserves multiple emojis", () => {
+    expect(runWithTag("🎵music🎵")).toEqual(["🎵music🎵"]);
+  });
+});